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Tractor Pulling Discussion Forum

John Deere crank and bore

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jimbo

09-15-2004 11:36:18




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Need help can I put a styled crank in a unstyled A, and still use the block or will the pistons hit the spark plugs.Also can I sleeve the block to fit a G pistons,or bigger. thanks




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jimbo

09-16-2004 17:50:11




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 Re: John Deere crank and bore in reply to jimbo, 09-15-2004 11:36:18  
what would a good price be to sleeve the block big'and what would the best block be. Would the crank and the pistons put me over 50 horse.



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use the.....

09-16-2004 18:42:20




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 Re: John Deere crank and bore in reply to jimbo, 09-16-2004 17:50:11  
use the crank and bore it to 5.75 pistons since you know it won't screw ya in the long run, and stroke the crank to 7.25 or 7.375..... .we have an A with a power block bored to 6.125 and a 7.25 crank that has pretty dang good power..... .it also has a cam and a 60 head...



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Mike N Mo

09-16-2004 14:58:28




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 Re: John Deere crank and bore in reply to jimbo, 09-15-2004 11:36:18  
Just a little additional to the posts below. The casting # you want is A2360R for the crank. If you want a power block look for a 6-1, but you will have to use a styled head. Use a late A head as it will give more compression (A3367R or A4226R). If you use styled pistons I thinkyou'll need styled rods as the wrist pin sizes are different Someone please correct me if I'm wrong on that. Mike



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toot

09-15-2004 12:13:27




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 Re: John Deere crank and bore in reply to jimbo, 09-15-2004 11:36:18  
Use a crank out of a 41-46 model to gain the 1/4" of stroke. The crank in a 39-40 model has the smaller stroke. The ends of a 47-52 model have the threaded end for the late starter type flywheel and will not work as well. No the pistons will not hit the plugs. Yes you can sleeve the A block to fit the G pistons for a lot of cash, or bore a A powerblock .125, flycut the ends of the g pistons to work. Pins are the same. Both option will be pretty pricey. Another option is to bore the A block to accept 70 gas pistons (5 7/8" bore) no sleeving will be neccesary.

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JDGnut

09-15-2004 12:11:05




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 Re: John Deere crank and bore in reply to jimbo, 09-15-2004 11:36:18  
The best choice for the crank is the middle style of crank.. (like a 46.. I don't remember the year split.) There were some things that changed a little on the later cranks, that took more parts changing to make them work.. You can use the early block or the middle year block... if you with the middle year block with will have to go with that style of head.. or the late head.. or a hiesler head.. (the bolt pattern is different on the early heads..) I think you should be OK on the sparkplug.. but you might have to clearance a little... but no big deal.. On the sleeve/borring of the block... all depends on what you want to do... they can be sleeved as deep as your pockets are... but just boring them.. 5.75 is about it... (friend bored on to fit 70 pistons.. 5.875.. first time out it broke the cylinder wall, because it was too thin.. a different block may result a little different.. they can be checked) If it is sleeved big.. there will be a set in the block.. (like a powerblock..)then you will have to deside on pistons... Need to decide what you are going to do with the block.. and go from there... Good Luck
JDGnut

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